Frame for flat screens



Aug. 9, w32. s. B. GORBUTT FRAME FOR FLAT SCREENS Filed May 3l, 1930 2 Sheets-Sheet l Q i-il- R s. B. GoRBuT-r s; B. GORBUTT 1,870,846

FRAME FOR FLAT SCREENS Filed May 3l 1930 2 Sheets-Sheei L/ENTER `GOQBUTT Il.' 'l

Aug. 9, 1932.

Patented Aug. 9, 1932 PAT-E SIDNEY E. GOEBUTT, OE roETLAND, OREGON` EEAME EOE ELAT SCREENS Application filed May 31,

This invention relates generally to the pa-V per making industry, and particularly to flat screens such as are commonly used in this industry. i

The main object of this invention is the construction of a newforin of frame forflat screens which will Overcome many of the difliculties ordinarily encountered in the use of frames consisting of a plurality of parts which are bolted/together.l v

The second object is to construct a one piece frame for flat screens which will be light of weight as compared with the usual type of cast frame and which will be sufficiently rigid to enable same to be assembled in the shop and transported on cars without danger of distortion; 'i

The third object is to construct'a frame for flat screens in which the desired inclina- 1 tion of the screens can be obtained without the employment of a large number of patterns, as is necessary where cast structures are employed. v

The fourth object is to construct a frame having the desired rigidity without requiring the performance of an objectionable amount of machine work in order to secure a. proper lit between contacting parts.

The fifth object is to construct a frame from structural steel the parts of which are made integral with each other by a welding process for the purpose of eliminating the difficulties usually experienced from warped or distorted frames, which is commonly the case when same are made from castings.

The sixth object is to construct a frame which will adapt itself to any inequalities in the foundation without danger of fracture.

The seventh object is to make a frame for flat screens which, as compared with the present type of cast frame, weighs less, costs Y account of its more uniform strength, eliminates pattern expense, reduces the cost of and the amount of machining required and also wasted labor and material caused by the discovery of a defective part in acasting after considerable work has been done thereon.

The eighth object is to so construct the 1930. serial No. 453,352.

frame that theliquor o-r pulpneedlnotv come in Contact with any metal', either within the screen or within the outlet. i

These, and other objects, will become more apparent fro-m the specification following as illustrated in the accompanying drawings, in which: l

Fig. 1 is aperspective View of the completed frame. Y

2 is a plan of one end of the frame. Figure 31s a perspective view ofl the upper corner forming parts before assembly. l

Fig. et is a view of the parts shown in Fig.Y 3 after being assembled. f'

Fig. 5 is a front elevation of the screen frame. i y v i Fig. 6 is an end elevation of screen frame.l l f Fig. 17 is an enlarged section'along the line 7-7 in Fig. y6.v

Fig. 8 is a section taken along the line 8-8 iiiFig.7. i Y Fig. 9 is a-sectiontaken along the-line 9 9 inFig.. ,Y i'

Similar numbersv of reference refer tosimilar parts throughout the severalV views." `i l h vReferring in detail to the 'drawingsy there is showna frame consistingof the upright legs 10 andll whose lower endseare joined` in kpairs by means of the crossties 12 upon Y which rests the I beam 13 whichy forms a support for the bearings 14 of the shaft 15, one end ofwhich carries a pulley 16 and is supported b'y'a standard 17.*y Y

Around the top of the leg s 10 and 11 are' mountedtheangle bars 18 and 19 whose ends 20 and21 are cut'as shown in Fig. 3, in order that the vertical faces 22 thereof may engage the outer sides ofthe legs l10. Secured against the inner faces 22 of the angle bars 18 are a plurality of angle clips 23. Theclips 23 are employed for the purpose of supporting the spring board mechanismplaced directlyun Vder the diaphragms, the details of which are wellunderstoo f Between thebars 18 are secured the angle bars 24. Gusset plates25 and 26 stiften the fasteniiigs between the bars 18 and'their rethe legs 11 are placed the braces 27 which are NT OFFICE* p spective legs 10 vand 11. Diagonally betweenl Y, L

Underneath the legs and 11 are welded the flat feet 29 by means of which the frame may besecured to a foundation, if desired.

10 Mounted o-n top of the bars 18 and 19 and upon the cross bars 24 are the wooden bunker*V members 30 and 31 to which are secured, by means of the brass bolts 32, theV rubber dia.

phragms 33. The upper portion 34' of the bunk members 30 and the portions 36fof the bunk members 31 Vare held in their respective supports bymeans of the bolts/35. It is desir'- able to-make the portions 30 and 31 of the bunk members of separate pieces of material from'the upper portions 34 yand 36, to which "f they may be secured'in any convenient manner. Resting on the portions 34 and 36 of the bunk members is the vat itself which consists of a box-like structure 37 across which are 2Q mounted the supports 38 for the screen securing bars 39, by means of which the edges ofthe perforated metal screen plates 40 are firmly securedV in a manner which is well'understood in the art. The vat 37 is secured upon the bunk portions 34 by means of the clamping bolts 41, the upper, end of which is provided with a link 42 which engages a hook 43 secured on' the outside of the vat 37. The lower end of i each bolt 41 is threaded and extends through an angle clip44 securedto a member, 18. On the outer side of one member 18 is placed a Wooden kspacer 45 against which is' secured the side 46 of the flow boX. Outlet openingsV l4g, 47` extend through the side 46; the spacer 45 and the bunk'portion 34; v Y

Numerous details of construction have been omittedfor the purpose of simplifying the description of this invention. For example, it 4 5A is well understood that a vibratory'movement is imparted to the diaphragm 33 by means of a shaker mechanism operated by the shaft 15, referably by means of a connecting rod 48. he precise manner in which this is accom- 59 plished is immaterial as far as this invention is concerned.

While at first glance it may appear that there has merely been constructed a frame of structural members to take the place of 5`Asimilar frames which have previously beenV madeof heavyV castings, it will be borne in mind that these devices are assembled atpthe factory and are shipped to their destination and Vthatany undue distortion of the parts,

llif made of cast iron, might be disastrous in Vview of the relatively great length thereof.

As previously stated, VYowing to the'uncertain i nature of the cast ironr structure a highfactor 'ofsafetymust'be employed. This, ofg A course, greatly increases the cost LAand weight;v

andmakes it impossible, under present methods, to unite the various frame sections into a unitary or one piece structure.

Referring particularly to the connection between the vat 37 and the frame itself it will be seen that by'interposing the bunk members 30 and 31 that the liquor does not comezinto contact withanyof the metal of the frame,'either`within the vat 37 or when passing through the outlets 47 into the flow boX. This is highlyffdesirable, owing to the manner in which the stockattacks ordinary metals suohas steel and cast iron and which naturally results in a discoloration of the stock coming in contact therewith.

It is a well known fact that framesfor flat screens have for many years beenv constructed of cast iron'whiclnowing to their nature, had' to be strongly built; I therefore do not intend to cover such devices broadly, but Ido intend to cover all y'such forms and modiiicationsas 4 pair of legs-having a cross tie between the lower ends thereof, and ay central longitudinaltie on the top side of said cross tiev and normal thereto forming afsupport for the operating mechanism' of the screenv diaphragm;

y f SIDNEYB. GORBUTT. 

